Saturday, November 19, 2011

It Folds!

The hinges may be a bit industrial looking but they do work. I avoided countersunk heads because it's a nightmare cutting big countersinks in stainless plate.  Perhaps some paint will help to disguise them.

Next sail will be in mild weather because this is one part of an outrigger canoe that do not want to fail.  I've left enough metal in the brackets that I would be able to go to larger size pins if I see any distortion in the 5/16" (8mm) ones I have now.

Thursday, November 10, 2011

Crossbeam Hinge

It's time to make my outrigger foldable.  I'll do this by hinging the crossbeams so that the ama can be lifted and pivoted over the main hull, thus reducing the overall beam to a legal trailerable width and avoiding the lashing and unlashing that gets old fast.
I've built a mockup of my Va'a Motu's forward crossbeam and am using 1/8" (3mm) plywood in place of the stainless steel plate I will use on the real hinge.

The beam is hollow with 3/4" (19mm) timber top and bottom with 1/4" (6mm) ply on the sides.  The timber on the Va'a Motu beam is actually two layers of 3/8" laminated together.

I drew a careful line where the beam will be cut and glued on two 1/8" plywood spacers that allow the hinge parts to slide past each other.

The 1/8" ply pieces that you see will be stainless steel plate and the fiberglass pins will be 5/16" stainless. I drilled pilot holes for the fasteners to make sure that the beam stays straight when it is reassembled.

I cut the beam in half with a thin kerf pull saw.

A bulkhead and side blocking to a depth of 4" (100mm) are glued into the cut ends of the beam to reinforce it.

The hinge plates are screwed into place and the pivot pins installed.  The real hinge will use epoxy bonded machine screws for fasteners.  The pivot pins will be drilled for locking pins and you only need to remove the bottom pin for the hinge to operate.

And there it is.  It seems stable enough for the job, so I'll hunt down some stainless plate and get to work on the real thing.

Wednesday, November 9, 2011

Rarotonga, Cook Islands

 From the Cook Island News
Of the boats he's built, Brent Fisher has named three for his family, blending the names of his children with that of his wife Annie.
Theres the Lou-Anne, the Peka-Anne now serving fish and chips as the Flying Boat and then theres the Corey-Anne, which is making its comeback after a 20-year hiatus.
Corey Fisher is building a business out of his namesake. Hes started up Fishin Tourz aboard the Corey-Anne, which he moors at Avana. Adorned with a Tangaroa carving by Mike Tavioni, she is a 26-foot outrigger.
I just enjoy taking people out, so I decided to put her back in the water, he said.
Fisher says he takes people out spearfishing, fishing and cruising for $90 a pop. The price, he says, includes all gear and transfers to and from the wharf, and up to four hours of angling.

Wednesday, November 2, 2011

The Need for Speed

A little more wind this time.  Boat speed peaked out at 9.8 knots (18 km/hr), but I will get out in stronger conditions to eventually reach my target 12 knots. 
The figure eight loop knots at the ends of my Spectra rigging are tightening and causing the rig to loosen up, so I've been adjusting them after each sail.  I've also moved the shroud attachment points 4" (100mm) farther aft for better support on broad reaches and runs.  I do this so you don't have to :-)
The GPS is showing a true 90 degrees between tacks which is better than the other rigs I've tried on canoes.  I guess there is something to having a tall narrow rig for going upwind.

 The shrouds are 5mm Spectra tied around a SS thimble.  A length of yellow 3mm Spectra is used to tension the shroud.  The shroud is attached to an aluminum tube that is lashed fore and aft to the main crossbeams.  The 50mm tube also supports the hiking seats.